From what I have been told. 4mix is all Stihl will have in the near future.
Ok i lied ...the only 4mix i like is the br600 because its just plain old bad ***..... i chased a brick across concrete with it one day...i need one of the feeler guages to set valve lash for it....my local dealer wont get one for me
I would reccomend bike bars for extended use ....if you gonna run 4 or 5 tanks in a few hours ....but standard trimming i would stay away from them... just my opinion